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 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
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package io.questdb.cairo.vm;

import io.questdb.log.Log;
import io.questdb.std.FilesFacade;

public class VmUtils {
    public static final int STRING_LENGTH_BYTES = 4;

    public static int getStorageLength(CharSequence s) {
        if (s == null) {
            return STRING_LENGTH_BYTES;
        }

        return STRING_LENGTH_BYTES + s.length() * 2;
    }

    public static long getStorageLength(int len) {
        return STRING_LENGTH_BYTES + len * 2L;
    }

    public static void bestEffortClose(FilesFacade ff, Log log, long fd, boolean truncate, long size, long mapPageSize) {
        try {
            if (truncate) {
                AppendOnlyVirtualMemory.bestEffortTruncate(ff, log, fd, size, mapPageSize);
            } else {
                log.debug().$("closed [fd=").$(fd).$(']').$();
            }
        } finally {
            if (fd > 0) {
                ff.close(fd);
            }
        }
    }
}